We’re being asked to determine in which solvent AgCl would be least soluble in.
The common ion effect states that the solubility of a salt is lower in the presence of a common ion. This means if there is a higher concentration of a common ion present, the less soluble a compound will be. The dissociation of AgCl in water is as follows:
The chloride ion, Cl–, has a charge of –1. Silver then has a charge of +1:
AgCl(s) ⇌ Ag+(aq) + Cl–(aq)
Among the given choices, only choices b, CaCl2, and c, HCl, contain a common ion, Cl–. Pure water and 0.10 M HNO3 don't contain common ions so the solubility of AgCl is not lowered in those.
We’ll now determine which between 0.10 M CaCl2 and 0.10 M HCl has a higher Cl– concentration: a higher Cl– (common ion) concentration will lead to lower solubility of AgCl.
AgCl would be least soluble at 25°C in ______ .
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